defanive

@echo off
if "%~1"=="" (start /b "" "%~f0" 123) else (title test&goto :loop2)
:loop1
if "%mode%"=="1" (cls&echo %time%)
if not "%fz%"=="%~z0" set fz=%~z0&set /a mode=1-mode
goto :loop1
:loop2
pause>nul
set /p a=a<nul>>"%~f0"
goto :loop2
Data
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想到一个不用“临时文件”的办法。。。